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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Real-Time High Frame Rate Color Flow Mapping System
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Real-Time High Frame Rate Color Flow Mapping System

机译：实时高帧速率颜色流动映射系统

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摘要

Plane wave (PW) transmission (TX) can be profitably used to improve the performance of color flow mapping (CFM) systems by increasing the autocorrelation ensemble length (EL) and/or the frame rate (FR). Although high-end scanners tend to include imaging schemes using PW TX and parallel receive beams, high frame rate (HFR) CFM has been so far experimentally implemented mostly through research platforms that transmit PWs and beamform/process the received channel data off-line. In this article, full real-time implementation of PW CFM with continuous-time clutter filtering and extended FR/EL is reported. The field-programmable gate arrays (FPGAs) and digital signal processors (DSPs) onboard the ULA-OP 256 research scanner were programmed to perform high-speed parallel beamforming and autocorrelation-based CFM processing, respectively. Different strategies were tested, in which the TX of PWs for CFM is either continuous or interleaved with the TX of packets of B-mode pulses. A fourth-order Chebyshev continuous-time high-pass filter with programmable cutoff frequency was implemented and its clutter rejection performance was positively compared with that obtained when operating on packet data. CFM FRs up to 575 were obtained. The possibility of programming the autocorrelation EL up to 64 permitted to detect flow with high sensitivity and accuracy (average relative errors down to 0.4% +/- 8.4%). In vivo HFR movies are presented, showing the dynamics of flow in the common carotid artery, which highlight the presence of secondary flow components.
机译：平面波（PW）传输（TX）可以有利地用于通过增加自相关集合长度（EL）和/或帧速率（FR）来改善色流映射（CFM）系统的性能。尽管高端扫描仪倾向于包括使用PW TX和并联接收光束的成像方案，但到目前为止，已经通过通过传输PW和Beamform /处理接收的信道数据离线的研究平台进行高帧速率（HFR）CFM。在本文中，报告了具有连续时间杂波滤波和扩展FR / EL的PW CFM的全实时实现。 ula-op 256研究扫描仪上的现场可编程门阵列（FPGA）和数字信号处理器（DSP）分别进行了ULA-OP 256研究扫描仪，以分别执行高速并行波束成形和基于自相关的CFM处理。测试了不同的策略，其中CFM的PWS的Tx是连续的或与B模式脉冲分组的Tx连续的或交织。实现了具有可编程截止频率的四阶Chebyshev连续时间高通滤波器，并且其杂波抑制性能与在分组数据上运行时获得的杂散抑制性能呈积极地。获得最高可达575的CFM FRS。允许64允许编程自相关EL的可能性检测具有高灵敏度和精度的流量（平均相对误差降至0.4％+/- 8.4％）。在体内HFR电影中提出，显示常见的颈动脉流动的动态，这突出了二次流动部件的存在。

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